Signal.



W, SPARKS.

SIGNALa APNIC/:mom man ocT. s, 19:5.

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. shaft is firmly 'WILLIAM srAnKs,

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F JACKSON, MCHGAN, ASSIGNOR TO THE SPRKS-WITHINGTON OF JACKSON, IvICHGAl\TA CORORATON OF MICHGi-AN.

SENAL.

Specification of Letters Patenti Patented May 22, 191% Application led October t5, 1915. Serial No. 54,735.

To all whom it may concern:

Be it known that l, TWILLIAM SrARnLs, al citizen of the United States of America, and residentof Jackson, in the county of Jackson, in the State of Michigan, have invented new and useful lmprovements in Signals, of whichthe following, taken in connection with the accompanying drawings, is a full, clear, and exact descriptiont T his invention relates to certain improvements in signals, and more particularly to cam operated signals of the diaphragm type, and in which the cam is mounted upon the shaft of a rotary electric motor positioned endwise toward and at the rear of the diaphragm. ln this type of signal it becomes advisable to provide means of adjustment for the armature shaft so as to vary the spaced distance of the cam from the diaphra m to properly position the parts for pro ucing the vmost efficient signal or alarm.

Further, in the commercial manufacture of armature shafts and bearings therefor, it is extremely dificult, if not practically impossible, to produce vthe parts with such eXactness so that they may be correlated in a structure without the necessity of adjustment to account for the variance in size,

both as originally produced and as resulting from wear consequent to use,

rlhe object, therefore, of this invention is to provide armature shaft of the motor whereby the held from longitudinal movement and the clatter consequent to such movement prevented, and at the same time providing` means of positive adjustment for the armature shaft elongitudinally in both directions and for properly assembling the parts in the process of manufacture, irrespective of slight variances in size.

Other objects and uses will appear from the following description, taken in connection with the accompanying drawings, in

which Figure l is a bottom plan view of the signal.

Fig. 2 is a longitudinal cross section of the signal inverted.

Fig .3 is a cross section on line 3-3, liig. l.

The device comprises a vibratory diaphragm -1- having itsl marginal edge clamped between the base -2- of an anrespect to the anA adjustable bearing for the plilier -3- and a ring -4- having -a circular opening eccentrically disposed with diaphragm -lfor the reception of a boss .-5- formed upon the end of a cup-shaped motor casing -6- having its rear end partially closed by a' transverse bar `-7 carrying` a bearing for an armature shaft 8 having its opposite end journaled in the end wall of the case -6- and projecting into the chamber formed between the diaphragm -l and ring -4-, and a suitable toothed actuator -94- is secured uponthis end of the motor shaft in any suitable way, as by nut -10-, the teeth of which actuator are adapted to contact with a wear-piece or projection -1lupon the diaphragm for forcing vibration of the latter as the toothed actuator is rotated.

ring -/lin any suitable way, as by screws -ll-, and carries suitable pole pieces and field coils,indicated at #12. rlhe commutator brushes -l8-, the springs 44st-, the conductors l5- and the guides or boxes flo* are similar to those shown in my co-pending application, Serial No. 861,220. i

rlhe rear open end of the case -6A is adapted to be closed by a cap --lG- having a central opening for receiving an in ternally threaded boss ,-l'- formed upon the cross bar fl- The internally threaded boss l7- is substantially axially disposed with respect to the case 6 and is adapted to adjust'ablyereceive an externally threaded sleeve l7-. j

v4The inner end of the sleeve -17 fis provided with a. stepped portion lof less diameter than the internal diameter of the sleeve to form an internally projecting circumferential` shoulder for cooperative engagement with a stepped member -IQ- mounted upon the end of the armature shaft near the commutator and held in place by a suitable locking nut -2l-.

rlhe rear portion of the sleeve -17 is internally threaded for the reception of a set screw -22- having a scat for receiving a rotary ball -23-, which ball in adjusted position of the set screw i22 bears against the end of the motor shaft -8- and forms an end-thrust bearing therefor.

lt will be readily apparent that-the set scre 22- may be adjusted to account for variance in the length of the motor sired position of adjustment by'a lock nut mounted upon said Although I have shown and described one particular construction and method of operation and adjustment of the parts, I do not desire to limit myself to the same, as changes may be made in the details of construction and operation Without departing from the spirit of this` invention as set forth in the appended claims.

f What I claim is: 'l

1. In a signal, a diaphragm, an electric `motor having its armature shaft presented endvvise toward the diaphragm, a rotor shaft adjacent the dia- .iragin, and an end-thrust bearing for the"4 armature shaft for positively moving said A shaft toward and from the diaphragm indey leo e motor p y endwjise toward the pendently of thebody of the motor.

2. In a' signal', a diaphragm, an electric having its 'armature shaft presented diaphragm, a rotor mounted -upon said lshaft adjacent the diaphralgm, an adjustable sleeve, and an endthrust bearing for said motor having an adjustable relation with said sleeve for positively holding the'motor shaft in a prede- 'termined position relativelyv to said sleeve.

3.v In a signal, a diaphragm having a Wear-piece associated therewith, an electric motor having its varmature shaft presented I endivise'toward the diaphragm, a rotor carfried by said motor shaft for contact with said Wear-piece,

a transverse bar at the rear of the motor,

said bar having a tubular boss, a sleeve adjustable through said boss,

s'aidsleeve having an inwardly projecting jj shoulder, the armature shaft protioned within the sleeve,

vided with a stepped member for engagement with said shoulder, and an adjustable set screw for holdingl said stepped member in substantial contact with said shoulder.

4. In a signal, a diaphragm, an electric motor, a rotor mounted upon the armature shaft of said motor, and an end-thrustbearing for the armature shaft for positively reciprocating said shaft independently of the body of, the motor.

5. In a signal, a diaphragm y Wear-piece associated therewith, an electric motor having its armature shaft presented endwise toward the diaphragm, a rotor mounted upon said shaft for contact with said Wearpiece, a sleeve adjustable toward and from the diaphragm, and adjustable means associated with the sleeve for causing the motor shaft to move in conjunction With the sleeve.

G. In a signal, a motor embodying an armature shaft and an inclosing shell, an actuator mounted on the phragm having a projection positioned in the path of movement of the actuator,l a

having a sleeve adjustable through the shell, and an end-thrust bearing for the motor shaft having a threaded relation with said sleeve.

7. In a signal, a motor embodying an armature shaft and an inclosing shell, an actuator mounted on the motor shaft, a diaphragm having a projection positioned in the path' of movement of the actuator, a sleeve adjustable through the shell, said' sleeve provided with a radially and inwardly projecting shoulder, cured to the motor shaft and rotatably posiand an end-thrust bearing forthe motor shaft adjustably engaged With the sleeve for holding said member on the shaft in substantial contact with said shoulder.

In Witness whereof I have hereunto set m hand this 27th day of September, 1915.

motor shaft, a diaa member se- 

